CAE中SPH方法出现下列问题，大佬们能否指点迷津？

Error in job Job-LS: The elements in element set ErrElemConvPartElemInContact are part of a deformable surface that is referenced by a *CONTACT PAIR option in addition to allowing the element to be converted to particles. For elements that can be converted to particles, contact should be defined using the *CONTACT option.

Job Job-LS: Abaqus/Explicit Packager aborted due to errors.